Katy Perry and John Mayer Leave a House Party

Katy Perry and John Mayer left a party in LA together on Saturday night. Earlier in the day, Katy wore a onesie for a movie date with just her friends.

The bash was the latest evening out on the town for the pair. John and Katy hit the Chateau Marmont last week, too. The couple went public with their romance after being linked in the press in July. Neither Katy nor John have spoken out about their newfound romance, but her ex Russell Brand recently spilled about their marriage during an interview on Howard Stern.